Pneumatic tire.



KKH. SCHMIDT.

PNEUMATIC TIRE.

KPPLlcATloN man oc. 28. 1915.

1,226,703. I l Patented May 22, 1917.

K. H. SCHMIDT.

PNEUMATIC TIRE.

APPLICATION' f|Ln .ocT. 28, 1915.

1,226,703. 1 Patented May 22,

ETS-S 2 SHE HEE KARL 4H. SCHMIDT, 0F CHICAGO, ILLINOIS.

PNEUMATIC TIRE.

Specification of Letters Patent.

Patented May 22, 1917.

Application filed October 28, 1915. Serial No. 58,311.

To all whom z't may concern:

' Be it known that I, KARL H. SCHMIDT, a citizen of the United States, residing at 108 North State street, in the City of Chicago, county of Cook, State of Illinois, have invented certain new and useful Improvements in Pneumatic Tires, of which the following is a specification.

My invention relates to an improvement in pneumatic tires and more particularly in 'tires of this type having an outer removable casing or shoe and a separate inner tube.

The principal objects of my invention 'are to incase and protect the inner tube independently of the outer casing or shoe of the tube, to lessen and in a large measure prevent blow-outs, to reduce the liability of puncture and to obviate any danger of the inner tube creeping within the outer casing and 'thereby rupturing the tube at the valve or tearing the projecting valve from the inner tube. l

These and other objects I accomplish by inclosing the inner tube in a separate encircling interior casing before it is placed within the outer casing or .shoe and inflated with air which serves as an interposed. intermediate inner protecting casing and by frictional engagement between its inner and outer surfaces and the respectiveouter and inner surfaces of the inner tube and outer casing caused by the air pressure when the tire is inflated prevents creeping or movement of the inner tube within 'the outer casing in a circumferential direction when the automobile or other vehicle equipped with the tire is traveling.

The objects and advantages of my invention will be more particularly described in the following specification and pointed out in the appended claim, in conjunction with the accompanying drawings consisting of two sheets 'to which reference is to be had and in which an embodiment of my invention is shown.

In the drawings, Figure vl is a side eleva` tion of a tire 'embodying the invention, the outer casing or shoe being removed; Fig. 2 is a View taken at right angles 'to Fig. l;

Fig. 3 is a fragmentary view in longitudi-A nal section showing the relative position of the inner tube, the outer casing or shoe, and the inclosing inner casing which is interposed between the outer shoe and inner tube; Fig. 4 is a transverse or radial section through a rim and a tire; Fig. 5 is a separate detached transverse section showing the inner casing alone and .without either thev inner tube or outer shoe; Fig. 6 is an enlarged fragmentary view, theshoe and rim being in section, and the casing which is placed intermediate the shoe andthe inner t-ube being in elevation; and Fig. 7 is a view 1n section showing the telescoping ends of the casing which incases the inner tube.

In referring to the embodiment of my invention shown in the accompanying drawings in detail like numerals designate like parts.

In Fig. 4, I have shown a conventional form of a clencher rim 1, also a clencher casing or outer shoe 2, and aninner tube 3, but it should be understood that my improvement is applicable to and may be used with many other forms of rims and tires.

A section through a felly 4, of a wheel upon which the rim is fitted is likewise shown in Fig. 4.

My improvement resides in an inclosing inner casing which is fitted in encircling position around the inner tube and can be employed to incase and protect the inner tube either when in deflated condition and separated from the outer casing or shoe of the tire, or when fitted within the tire and inflated as shown in Fig. 4.

The improved inner casing is not cemented orattached -to the inner tube in any way, being merely fit-ted in encircling positionaround the tube and can be wrapped up separately when the tube is deflated or wrapped around the tube to -p'rotect the same as desired.

As shown, this casing is composed of three superimposed layers, an inner layer '5, an intermediate layer, 6, and an outer layer 7 but a greater or lesser number of layers may be utilized as desired.

The inner layer 5 is preferably made sufiiciently wide to extend entirely around the inner tube with its side magins 8 lapping each other as shown in Figs. 4 and 5, and the intermediate and outer layers are narrower in width preferably terminating slightly below the center of the tube.

However, they mayif desired be made of equal' width as desired.

Also the casing may be made endless or with two ends which telescopewith each other as shown at 9 in Figs. l, 6 and 7..

In thev construction shown the layers are secured to each other by lines of longitudinal parallel stitching see Fig. 2, which extends throughout the middle portions of layers, the side margin being unattached to each other.

While this improved casing may b e .made of any suitable fabric, I prefer to employ the material or cloth commonly known as corduroy as it is provided on one side with a rough corrugated and comparatively soft surface 11, and upon the opposite side with a fairly hard smooth surface 12, see Fig. 3.

The layers are preferably so arranged that the corrugated surface of the inner layer will be in contact with the surface of the inner tube and the corrugated surface of the outer larger in contact with the inner surface of the outer casing or shoe.

The reason'for this is that the raised corrugations are pressed or embedded in the opposed surfaces of the inner tube and outer casing by the air pressure when the tire is inflated as clearly shown. in Fig. 3, and thus provides a frictional lock which extends` completely around the tire and prevents creeping of the tube within the outer casing.

I prefer to have the corrugations 11 extend diagonally or obliquely cutting the cloth onthe bias and with the corrugations cf the inner layer extending substantially in the samedirection asy or parallel with the corrugations of the outer layer.

The intermediate layer is preferably provided with an end flap or extension 13, which is used to draw one end firmly over the otherin lapping position, said flap 13 being sewed or secured in any desired manner to the intermediate layer of the protecting casing or being formed integrally with said intermediate layer and simply being an extended portion thereof. u

In fitting my improved inner protecting casing upon an inner tube it is fitted snugly around the same and the side margins 8 are lapped, then the extension 13 is pulled to draw the outer end firmly over the underneath inner end.

The tube 3, is provided with the usual valve stem 14.

While I have illustrated and described a preferred form of construction for carrying my invention into effect, this is capable of a wide range of variation, alteration, modification and change without departing from or may be construed to be within the scope` thereof by involving the doctrine of equivalents.

The main object for arranging the corduroy with the cloth cut on the bias or with the corrugations extending diagonally is that the cloth will yield or stretch both circumferentially and transversely thus permitting it to give or move in union with the outer casing and tube as theA tire is indented or flattened.

In producing the improved device, I pref-v erably take a strip of the material sufficiently long to extend circumferentially around the inner tube and shrink it upon its side margins without shrinking the middle portion.

This gives a concave form in cross section .to the strip and also causes it to assume a curved shape longitudinally thus adapting it to fit snugly and evenly around the inner tube.

One or 'more or all of the strips of material making up the device may be shrunk in this peculiar manner as desired.

y What I claim as my invention and desire t0 secure by Letters Patent is:

In a device of the class described, an outer casing, an inner tube, and a separate protecting inner casing interposed between the outer casing and the inner tube; said inner casing being composed of several long strip like layers of fabric secured together and having its side margins shrunk to cause it to naturally assume a concave form in cross section and curved form longitudinally; said inner casing being adapted to be wrapped transversely around the inner tube with its side margins, in lapping position and its ends telescoped, and a projecting flap attached tothe outer telescoping. end to enable the` inner casing to be pulled tightly around the tire in a circumferential direction.

In testimony whereof I .have hereunto set my hand.

Chicago, Illinois, October 26th, 1915.

KARL H. SCHMIDT. 

